When planning a trip, most people go to large travel sites like Expedia and Priceline to book their flight, hotel, and rental car all at the same time with one easy payment. These big all-in-one websites are the best at making travel arrangements convenient, and typically offer discounts for packaged purchases. With a little time invested searching for the best deal, you can't go wrong with these sites. However the savings aren't limited to the on-site packaged deals.Most of the large travel sites have affiliate sites that send them traffic. These affiliate sites come in many forms and give buyers a percentage off from their purchase. There are two main kinds of discount travel sites, one is an informational guide (usually in the form of a blog), and the other is a rank and review site.